HI
I got a 327 chevy motor with Dart 165cc heads on it that keeps fouling the plugs out. The spec sheet calls for either champion rv12yc or AC r44ts plugs.The engine also has a mallory unilite distribuator new mallory wires.I have a edelbrock 600 carb on a single top tunnel ram manifold that when you screw the mixture screws in all the way in the engine keeps on running. Ive sprayed carb cleaner arond the carb and around the intake manifold for a vaccum leak but the engine does not speed up . Whats my problems?Would using a MSD 6 ignition box solve some of the problems?Thanks Alot, ED

Screwing the idle mixers all the in leans the mixture. If you have no response from these adjustments' you have a overly rich condition. Which is indicated by your plugs condition. A vacuum leak causes a lean condition. I would look at the carb(s) for furtherer analysis.

Broken Power Valve, Float to high, pressure to high, needle and seats...

anywho... could be your idle is set too high, that would cancel out the mixture screws. how far open are the throttle plates at idle?. or like johnson said, bad needle and seats, if somebody screwed the mix screws in too hard then that would flatten the tip. but if you can screw them in all the way and it makes no difference i'd lean twards the throttle plates open too far or the tip of the mixture screws are flattened....

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